Skateboard



FIG. 1 is an upper, front, and right side perspective view of a skateboard showing the new design;

FIG. 2 is an upper, front, and left side perspective view thereof;

FIG. 3 is an upper, rear, and left side perspective view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a left side elevational view thereof;

FIG. 8 is a rear elevational view thereof; and,

FIG. 9 is a front elevational view thereof.

The dashed lines and structure they depict form no part of the claimed design. 

CLAIM The ornamental design for a skateboard, as shown and described. 